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[SystemZ] Add hasSideEffects flag on Serialize instruction.

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Serialize will perform a hardware serialization operation, and is
acting as a memory barrier. Therefore it must have the hasSideEffects
flag set so it will be treated as a global memory object.

Reviewed by Ulrich Weigand

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257036 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jonas Paulsson 2016-01-07 07:20:55 +00:00
parent 8159bdef56
commit 8c8ee7cee1
1 changed files with 3 additions and 0 deletions
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3
lib/Target/SystemZ/SystemZInstrInfo.td
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@ -1219,6 +1219,9 @@ def PFDRL : PrefetchRILPC<"pfdrl", 0xC62, z_prefetch>;
// Atomic operations
//===----------------------------------------------------------------------===//
// A serialization instruction that acts as a barrier for all memory
// accesses, which expands to "bcr 14, 0".
let hasSideEffects = 1 in
def Serialize : Alias<2, (outs), (ins), [(z_serialize)]>;
let Predicates = [FeatureInterlockedAccess1], Defs = [CC] in {